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WASHINGTON, DC - MARCH 18: Freshman U.S. Sen. Tom Cotton (R-AR) participates in a conversation about American foreign strategy and statesmanship at the Hudson Institute March 18, 2015 in Washington, DC. An Army veteran of the Iraq war, Cotton, 37, has been the focus of praise and criticisim after he authored a letter to the Iranian leadership that warned about making a nuclear agreement with President Barack Obama. The letter, signed by 47 of Cotton's fellow Republican senators, states 'The next president could revoke such an executive agreement with the stroke of a pen, and future Congresses could modify the terms of the agreement at any time.' (Photo by Chip Somodevilla/Getty Images)